Fog nozzle



May 23, 1944. G. R. MEADOR FOG NOZZLE Filed Feb. 20, 1942 www..

Patented May 23, 1944 vSTATES EN! FFQE 3 Claims.

This invention relates to a nozzle intended for creating a fog liquid, and, while it may be employed for fogging various liquids, it is particularly desired for producing a fog of Water particles.

For many purposes, it is desirable to produce what is termed a water fog, as distinguished from a water spray. A nozzle is considered to produce a fog where the particles of water in the area covered by the discharge from the nozzle are al1 of substantially the same size and Where the distribution of water throughout the area covered by the nozzle is substantially uniform. In this respect, fog distinguishes from a water spray. A nozzle which produces a water spray delivers the water over a part of the area covered by the spray in much larger droplets than in other parts of the spray. For many purposes a fog is useful where a water spray is not useful. For example, a water fog is etl'ective for extinguishing a gasoline re where a water spray is ineffective. Likewise, a fog is capable of extinguishing nres without substantial water damage where a spray is not. In certain cases, a fog may be employed for cooling metals where a water spray can not be employed for the reason that a water spray would cause localized hardening of the metal.

It is a general object of the present invention to provide a nozzle capable of producing a fog when connected to a low pressure source.

Another object of the present invention is to provide a. nozzle for creating fog, which nozzle is adapted for manufacture in small sizes at relatively low costs.

Other objects and advantages of the invention will be' apparent from a description of a prei'erred form or example of a nozzle embodying the invention as given in connection with the accompanying drawing, in which Figure 1 is an elevation in vertical section.

Figure 2 is a. top view in partial section of the inner dome member of the nozzle.

Referring to the drawing, in which Figure 1 illustrates in substantially twice normal scale the construction of the nozzle, l generally indicates a liquid supply pipe which is indicated as threaded at its end 2. The nozzle of the present invention includes a socket 3 threaded to the supply pipe I. The nozzle also includes an outer dome-shaped member 4 which, although indic'ated in the drawing as made separate from the socket 3 and soldered thereto as indicated at 3, may constitute an integral extension of the socket 3 in certain forms of the invention. The dome member t is provided at its apex, as indicated at t, with an orice i'or the discharge of the fog- Where a tne fog is desired, this opening should be relatively small; for example, I have produced the same using a No. drill. It is obvious, howy ever, that for dierent purposes larger or smaller size openings may be desirable. The nozzle also includes an inner dome member 8, the outer walls of which are spaced slightly from the inner walls of the dome member Il. The inner dome member t is preferably held in position by being soldered to the outervdome member, as indicated at 6a. A. packing ring l, which may be of rubber-like composition, is placed between the end of the supply pipe l and inner dome member 6.

The inner dome t is provided with a plurality of orifices 'l near its base. .I have found generally two of such orifices to be the proper number. Such oriiices are so designed as to permit the discharge of water from the pipe I into the space t between the two domes, the water being discharged at such an angle as to create a rotary movement of water occupying the space 8 and also preferably at such an angle as to assist the movement of such water towards the opening 5 in the apex of the outer dome d. The orices 'l also preferably taper outwardly and may be conveniently formed by a pointed punch, said pointed punch preferably piercing the dome B at an angle of about 45, with the axis of the nozzle as indicated by the dotted lines in Figure 1 and also at an angle of about 45 to the tangent of the inner dome y6, as indicated by the dotted lines in Figure 2. When the orifices I are formed by the punch entering at the specied angles, I have found that a proper movement of the water between the two domes is created which permits the formation of a desired fog water leaving the orifice 5. It is to be understood, of course, that it is not essential to this invention that the exact angle specied be employed, the exact angle I have used being specified merely to illustrate the best form of the invention known. I generally nd it desirable to have the diameter of the orices 'l at their inner ends somewhat larger than the diameter of the orice S-say twice the diameter of said oricealthough considerable variations in such respect may be made in certain forms of the nozzle.

In order that the most desirable form of fog may be created by the nozzle, it is important that the space 8 for the movement of the water leaving the orifices l and passing to the orifice 5 be carefully designed. The space between the domes 4 and t should be substantially uniform throughout most of the travels of the water from the oriees i to the orice is, but at the uppe end of the dome 6 I nd it advisable in some nozzles te enlarge somewhat the space for the water, as by flattening the inner dome 6, as indicated 'et The attening of the inner dome as indicated at 9, seems to lead te the production of a sprv having ner water particles.

By the particular construction of nozzle illustrated I have found it possible with low water pressures, for example as low as'20 pounds per square inch, to create a desirable water fog without the creation of any dripping water from the nozzle. The nozzle of the present invention nds many advantageous uses.

While the particular form of the nozzle herein described is well adapted to carry out the objects of the present invention, it is to be understood that various modiiications and changes may be made, and this invention includes all such modifications and changes as come within the scope ci the appended claims.

I claim:

1. A nozzle for delivering s. fog, which comprises a pair of substantially semi-spherically shaped domes forming a space therebetween for the passage of fluid, the outer dome having an orifice in its apex and the inner dome having a plurality oi' oriiices spaced from its apex and 5 2. A nozzle for delivering a i'og, which comprises apairof shaped domes forming l space therebetween for the passage of mild, theouter dome having an oriilce in its apex and thefinner dome having a 10 plurality of orifices spaced from its apex and angled to direct the movement of thewater both towards the oriilce of the outer dome and in a rotary direction, the oriiices in the inner dome being tapered and larger than the orifice in the '15 outer dome.

\ 3. A spray nozzle, comprising inner and outer `domes spaced apart. the domes being substantially semi-sphericaily shaped. means for delivering .water to within the inner dome, the outer 20 dome having an oriiice in its apex, orifices in the inner dome angled to direct the movement of the water both towards the oriilce of the outer dome and in a rotary direction for effecting a rotary movement;r of the water passing 25 through the space between the domes and the orifice in the apex ot the outer dome, the inner dome being ilattened at its apex.

GORDON R. MEADOR. 

